NASHUA — A Nashua couple were arrested Wednesday night after a months-long undercover investigation that began after police received numerous citizens' complaints about heroin sales, investigators said.

Joshua Parsons, 32, and Alexis Budesky, 27, both of 2 Progress Ave., Room 347, were arrested just after 7 p.m. by members of the department's Problem Oriented Policing Unit.

Parsons is being held on $100,000 cash bail on three counts of unlawful sale of a narcotic drug, heroin, one count of conspiracy to sell heroin, and one charge of possessing heroin with intent to distribute.

Budesky is charged with one count of selling heroin and is being held on $25,000 cash/surety bail.

Lt. David Bailey of the city's Narcotics Intelligence Division said Parsons faces the possiblity of 15 to 30 years in prison if convicted of the distribution charge alone. That's because police recovered more than 5 grams of heroin in the residence, resulting in the enhanced felony penalty.

Bailey would not say how much heroin was seized because, he said, it still had to be weighed at the state police laboratory.

He explained someone buying heroin for personal use usually pays about $40 for an amount about the size of a postage stamp.

What's next:Parsons and Budesky are to be arraigned Thursday in 9th Circuit Court, Nashua District Division.